We're dividing 28375787 by 21 
We're looking to find how many times 21 goes into 28375787.

Moving on to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 21

Going ahead to step 2:
If we divide 28 by 21, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 21 from 28 and we're left with 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 21

On to step 3:
21 can be fit into 73 3 times, resulting in a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
The remainder is 10 after subtracting 63 from 73.
Include the next digit (7) from the dividend after 10, then repeat: 107 / 21

On to step 4:
If we divide 107 by 21, we get 5 and a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 135.0
Subtracting 105 from 107 leaves us with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 21

Advancing to step 5:
25 divided by 21 is 1 with a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 1351.0
Deduct 21 from 25 and we're left with 4.
Grab the next digit (7) from the dividend, add it to 4, then carry on: 47 / 21

Step 6:
The number 21 fits into 47 2 times, leaving a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 13512.0
Subtracting 42 from 47 leaves us with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 21

On to step 7:
The number 21 fits into 58 2 times, leaving a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 135122.0
If we subtract 42 from 58, we get 16.
Take the next digit (7) from the dividend and append it to 16, then repeat: 167 / 21

Going ahead to step 8:
167 divided by 21 is 7 with a remainder of 20.
The next digit of our result is 7. 
Result so far: 1351227.0
Deduct 147 from 167 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 1351227.9
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 10:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 1351227.95
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 11:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 1351227.952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 12:
21 goes into 80 3 times with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 1351227.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 13:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 1351227.95238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 14:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 1351227.95238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 15:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 1351227.9523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 16:
110 divided by 21 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 1351227.95238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 1351227.95238095 and a remainder of 5e-09.